﻿ 圆形曲面网板水动力学性能研究

# 圆形曲面网板水动力学性能研究Study on the Hydrodynamic Performance of Circular Cambered Otter Board

Abstract: Trawling is one of the main methods of modern fisheries, of which the single trawling is the common operation types. Otter board is the vital components of a single trawler system; it can provide the desired horizontal opening of a trawl net. In the present study, the hydrodynamic of a circular cambered otter board was studied using flume tank experiment and numerical simulation. The lift/drag coefficient, lift-to-drag ratio and center-of-pressure coefficient were obtained during the data processing, and the flow distribution around the otter board was analyzed according to the numerical results. It showed that the otter board had a good hydrodynamic performance for its high lift coefficient and lift-to-drag ratio, and the camber/deflector structure can delay the flow separation. Numerical simulation results showed a good agreement with experiment ones and could predict the critical angle of attack. Simulation errors the maximum lift coefficient and lift-to-drag ratio were under 10%. Given the otter boards are operated in water, it was suggested to apply both flume tank experiment and numerical simulation to study the hydrodynamic performance of otter board.

1. 引言

2. 材料与方法

2.1. 模型网板

$\frac{{l}_{1}}{{l}_{2}}=s,\text{\hspace{0.17em}}\text{\hspace{0.17em}}\frac{{S}_{1}}{{S}_{2}}={s}^{2},\text{\hspace{0.17em}}\text{\hspace{0.17em}}\frac{{v}_{1}}{{v}_{2}}=\sqrt{s}$ (1)

Figure 1. Structure of the model otter board (The coordinate frame on it was used to calculate the center-of-pressure of the otter board)

Table 1. Detailed parameters of the model otter board

2.2. 试验方法

2.2.1. 水槽试验

2.2.2. 数值模拟

Table 2. Parameter settings of the numerical simulation

Figure 2. Computational grids of the domain during flume tank simulation

2.3. 数据处理

${C}_{L}=\frac{{F}_{L}}{\frac{1}{2}\rho S{v}^{2}}$ (2)

${C}_{D}=\frac{{F}_{D}}{\frac{1}{2}\rho S{v}^{2}}$ (3)

${C}_{mx}=\frac{2{M}_{x}}{\rho S{v}^{2}l}$ (4)

${C}_{mz}=\frac{2{M}_{z}}{\rho S{v}^{2}c}$ (5)

$K=\frac{{C}_{L}}{{C}_{D}}$ (6)

${C}_{pl}=\frac{{d}_{l}}{l}=\frac{{C}_{mx}}{{C}_{L}\mathrm{cos}\alpha +{C}_{D}\mathrm{sin}\alpha }$ (7)

${C}_{pc}=\frac{{d}_{c}}{c}=\frac{{C}_{mz}}{{C}_{L}\mathrm{cos}\alpha +{C}_{D}\mathrm{sin}\alpha }$ (8)

3. 结果

3.1. 网板升力系数

3.2. 网板阻力系数

3.3. 网板升阻比

Figure 3. The result of flume tank model experiment and numerical simulation

Figure 4. Lift-to-drag ratio of the otter board in relation to the angle of attack

3.4. 网板压力中心系数

3.5. 网板周围流场

Figure 5. Center-of-pressure coefficients of the otter board in relation to the angle of attack

Figure 6. Streamlines from a horizontal plane cutting through the center section of the otter board

4. 讨论与结论

4.1. 网板水动力性能

4.2. 数值模拟验证

NOTES

*通讯作者。

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